.nav-link {
  position: absolute;
  display: fixed;
  left: 0;
  bottom: 0;
  height: 50px;
  width: 100%;

}

.nav-link ul {
  padding: 0;
  list-style: none;
  display: flex;
  justify-content: space-around;
}

.nav-link ul li {
  flex: 1;
  height: 50px;
}

.nav-link ul a {
  text-decoration: none;
  display: block;
  line-height: 50px;
  text-align: center;
  border-top: solid 2px #666;
}

.nav-link ul a.active {
  background-color: orangered;
  color: white;
  border-top: solid 2px orangered;
}